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Showing posts with the label Economic Zoology

Ethology And Its Methods || Animal Behaviour

  ETHOLOGY AND ITS METHODS   The various aspects related with animal behavior can be studied by applying the following methods - 1. Under natural conditions. 2. Experimental Analysis 3. Statistical Analysis 1. Under Natural Conditions: - The best way of studying animal behavior is under natural conditions. Observation may be in the form of field notes, checklist of behavior patterns, tape recorders, motion pictures etc. While studying animal behavior in natural surroundings circadian rhythms and seasonal cycles are taken into consideration. 2. Experimental Analysis: - Experiments are conducted in two ways viz. Field experiment and Laboratory experiment – (A) Field Experiment: - These are performed with least disturbance to the animal. The first phase involves a thorough description of all aspects of the animal under observation. For this binocular and infrared devices are required when more than one individuals are to be observed, it is desirable to make...

LAC CULTURE || ECONOMIC ZOOLOGY || B.Sc Class Notes|| PDF

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LAC CULTURE Lac is a natural resin of animal origin. It is secreted by an insect, known as lac-insect. In order to obtain lac, these insects are cultured and the technique is called lac-culture. It involves proper care of host plants, regular pruning of host plants, propagation, collection and processing of lac.   History and Nomenclature   Lac has been used in India from time immemorial for several purposes, from the epic of Mahabharat it has been recorded that Kauravas built a palace of lac for the destruction of Pandavas. We come across references of lac in the Atharvaveda and Mahabharata, so it can be presumed that ancient Hindus were quite familiar with lac and its uses.   Scientific study of lac started much later. In 1709 Father Tachard discovered the insect that produced lac. First of all Kerr (1782) gave the name Coccus lacca which was also agreed by Ratzeburi (1833) and Carter (1861). Later Green (1922) and Chatterjee (191...